OFDM Multiple Antennas Cognitive Radio Relay CDMA Synchronization Channel Estimation Spectrum Sharing Interference Cancellation Neural Networks Resource Allocation Spectrum Sensing Full duplex Stochastic Geometry Equalizer Bi-Directional Feedback Femtocell Energy Harvesting Heterogeneous Networks Device-to-Device (D2D) HetNet Spectral efficiency Idle cells Cell Search Ultra-dense small cell networks SINR mismatch problem FBMC Simultaneous Sensing and Transmission Correlated MIMO UWB Cognitive relay networks selection diversity sensing duration transmission capacity (TC) self-interference cancellation in-band full-duplex system automatic repeat request (ARQ) Two-way communications outage probability Latency bursty traffic model OQAM mode selection multi-spectral achievable sum rate Bi-directional full-duplex Heterogeneous channel estimation capability Shortened TTI full-duplex relay Ultra-dense small cell Channel estimation error Handoff Aggregate interference UL grant free NOMA Vehicular and wireless technologies beamforming Long Term Evolution-Advanced LTE-TDD Asynchronized system Cross-link interference Link adaptation Iterative decoder Dynamic TDD 5G networks interference coordination MU-MIMO coexistence time-frequency efficiency Cellular networks TS-W-OFDM Windowing K-S statistics MIMO singular value decomposition Time spreading full-duplex cellular